where \(r=|\mathbf {x}-\mathbf {y}|\)  the distance between a reception point \(\mathbf {x}\)  and the source \(\mathbf {y}\) . Even though this is a formal solution it still allow us to extract some significant conclusions by including both retarded and advanced terms. The existence of the retarded term is rather uncontroversial but this cannot be said for the advanced term since unavoidably introduces an element of retrocausation [1]}. A similar issue is well-known in classical radiation theory where the advanced terms are excluded on physical grounds, but it is not clear if the same kind of argumentation could be employed here. Since the Bohmian quantum potential implies nonlocal effects it strongly suggests that we cannot discard advanced solutions without loss of essential physics. Furthermore, for two or more particles the coincidence probability density is connected to the total probability that appears in Bell type theorems which is a clear indication that the advanced term needs to be included in order to violate the classical correlations. This is obviously not a mathematical argument and the matter needs further consideration but it is plausible to assume that the effect of advanced terms in a many-particle context would definitely affect correlations and violate the usual assumed conditions for Bell-type theorems [2]}. Obviously in the context of a classical electromagnetic or acoustic field there is no possibility of violating that family of inequalities but this is cerainly not the case for a quantum coincidence probability. One of course could escape the conclusion by modifying the ordinary Schrödinger dynamics. Introducing now the stochastic osmotic velocity [3]}, [4]}, which is also implied in earlier formulas as in (21) and (25),
\(\mathbf {u}=\frac{1}{2}\left(\frac{\nabla \Phi }{\Phi }+\frac{\nabla \Phi ^{*}}{\Phi ^{*}}\right)\) 
